<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
        <!-- 警告区域 -->
          <el-alert show-icon title="注意：只允许为第三级分类设置相关参数!" type="warning" :closable="false">
          </el-alert>

          <!-- 选择商品分类区域 -->
          <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader expand-trigger="hover" :options="catelist"
                :props="cateProps" v-model="selectedCateKeys" @change="handleChange">
                </el-cascader>
            </el-col>
          </el-row>

          <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面版 -->
            <el-tab-pane label="动态参数" name="many">
                <!-- 添加参数的按钮 -->
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input class="input-new-tag"
                            v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                            ref="saveTagInput" size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面版 -->
            <el-tab-pane label="静态属性" name="only">
                <!-- 添加属性的按钮 -->
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                <!-- 精态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input class="input-new-tag"
                            v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                            ref="saveTagInput" size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数对话框 -->
        <el-dialog :title="'添加'+titleText"
        :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 添加参数对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
               <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
               </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数对话框 -->
        <el-dialog :title="'修改'+titleText"
        :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <!-- 添加参数对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
               <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
               </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
    export default{
        data(){
            return{
                //商品分类列表
                catelist:[],
                //次联选择框的配置对象
                cateProps:{
                    value:'cat_id',
                    label:'cat_name',
                    children:'children'
                },
                //级联选择框双向绑定的数据
                selectedCateKeys:[],
                //被激活的页签的名称
                activeName:'many',
                //动静态属性数据
                manyTableData:[],
                onlyTableData:[],
                //控制添加对话框的显示与隐藏
                addDialogVisible:false,
                //添加参数的表单数据对象
                addForm:{},
                //添加表单验证规则
                addFormRules:{
                    attr_name: { required:true, message:'请输入参数名称',trigger:'blur'}
                },
                //控制修改对话框的显示与隐藏
                editDialogVisible:false,
                //修改参数的表单数据对象
                editForm:{},
                //修改表单验证规则
                editFormRules:{
                    attr_name: { required:true, message:'请输入参数名称',trigger:'blur'}
                }
            }
        },
        created(){
            this.getCateList()
        },
        methods: {
            //获取商品分类数据
            async getCateList(){
                const {data:res}=await this.$http.get('categories')
                if(res.meta.status!==200){
                    return this.$message.error('获取商品分类失败')
                }

                this.catelist=res.data

                console.log(this.catelist)
            },
            //级联选择框中项变化，会触发这个函数
            handleChange(){
                this.getParamsData()
            },
            //tab页点击事件的处理函数
            handleTabClick(){
                console.log(this.activeName);
                this.getParamsData()

            },
            //获取参数列表数据
            async getParamsData(){
                //证明选中是不是三级分类
                // console.log(this.selectedCateKeys);
                if(this.selectedCateKeys.length !==3){
                    this.selectedCateKeys=[]
                    this.manyTableData=[]
                    this.onlyTableData=[]
                    return
                }
                //证明选中是三级分类
                console.log(this.selectedCateKeys);
                // console.log(this.selectedCateKeys[2]);
                //根据所选分类的id，和当前所选的面板，获取对应参数
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:this.activeName}
                })

                if(res.meta.status !==200){
                    // console.log(res);
                    return this.$message.error('获取参数列表失败')
                }

                
                res.data.forEach(item=>{
                    item.attr_vals=item.attr_vals ? item.attr_vals.split(' ') : []
                    //控制文本的显示与隐藏
                    item.inputVisible=false
                    //文本框输入的值
                    item.inputVisible=''

                })

                console.log(res.data);
                if(this.activeName=='many'){
                    this.manyTableData=res.data
                }else{
                    this.onlyTableData=res.data
                }
            },
            //监听对话框的关闭事件
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            //点击按钮添加参数
            addParams(){
                this.$refs.addFormRef.validate(async valid=>{
                    if(!valid) return
                    const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                        attr_name:this.addForm.attr_name,
                        attr_sel:this.activeName
                    })
                    if(res.meta.status!==201){
                        return this.$message.error('添加参数失败')
                    }

                    this.$message.success('添加参数成功')
                    this.addDialogVisible=false
                    this.getParamsData()
                })
            },
            //点击按钮，展示修改对话框
            async showEditDialog(attr_id){
                //查询当前信息
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                    params:{attr_sel:this.activeName}
                })
                
                if(res.meta.status!==200){
                    return this.$message.error('获取信息失败')
                }
                this.editForm=res.data
                this.editDialogVisible=true
            },
            //重置修改表单
            editDialogClosed(){
                this.$refs.editFormRef.resetFields()
            },
            //点击按钮修改参数
            editParams(){
                this.$refs.editFormRef.validate(async valid=>{
                    if(!valid) return
                    const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                        attr_name:this.editForm.attr_name,
                        attr_sel:this.activeName
                    })
                    if(res.meta.status!==200){
                        return this.$message.error('修改参数失败')
                    }

                    this.$message.success('修改参数成功')
                    this.editDialogVisible=false
                    this.getParamsData()
                })
            },
            //根据id删除对应的参数项
            async removeParams(attr_id){
                const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }).catch(err=>err)

                //如果用户确认删除，返回字符串confirm
                //如果用户取消删除，则返回字符串 cancel
                // console.log(confirmResult);
                if(confirmResult !='confirm'){
                    return this.$message.info('已取消删除')
                }
                // console.log('确认删除');

                const {data: res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
          
                if(res.meta.status !==200){
                    return this.$message.error('删除参数失败')
                }
                this.$message.success('删除参数成功')
                this.getParamsData()
            },
            //文本框失去焦点或者按下就会触发
            async handleInputConfirm(row){
                // console.log('ok');
                if(row.inputValue.trim().length === 0){
                    row.inputValue=''
                    row.inputVisible=false
                    return
                }

                row.attr_vals.push(row.inputValue.trim())
                row.inputValue=''
                row.inputVisible=false

                //发起请求保存此次操作
                this.saveAttrVals(row)
            },
            //点击按钮展示文本输入框
            showInput(row){
                row.inputVisible=true
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            //保存到数据库
            async saveAttrVals(row){
                //发起请求保存此次操作
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                    attr_name:row.attr_name,
                    attr_sel:row.attr_sel,
                    attr_vals:row.attr_vals.join(' ')
                })

                if(res.meta.status !==200){
                    return this.$message.error('修改参数失败')
                }

                this.$message.success('修改参数成功')
            },
            //删除对应的参数选项
            handleClose(i,row){
                row.attr_vals.splice(i,1)
                this.saveAttrVals(row)
            }
        },
        computed:{
            //如果按钮被禁用返回true
            isBtnDisabled(){
                if(this.selectedCateKeys.length !==3){
                    return true
                }
                return false
            },
            //选中当前三级分类
            cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
            },
            //动态计算标题的文本
            titleText(){
                if(this.activeName==='many'){
                    return '动态参数'
                }
                return '静态属性'
            }
        }
        
    }
</script>

<style scoped>
.cat_opt{
    margin: 15px 0;
}

.el-tag{
margin: 10px;
}

.input-new-tag{
width: 120px;
}

</style>